Devices helpers

METRONOME-CONDUCTOR

27.05.201813.05.2018Devices helpers

When learning to play a musical instrument to set the tempo often use a mechanical or electronic metronome. Last and I made one of the most popular modern developments. However, during operation it was found that this device is inferior to its mechanical counterpart, with adjustable pendulum, knob, jiggle measured which are perceived as the movement of the baton of the conductor.

WAKE UP ANY

27.05.201813.05.2018Devices helpers

Currently, widespread electronic TRAVEL CLOCK and similar clock with a miniature buzzer as sound source — a reminder about the occurrence of the deadline. However, a small volume of the regular signal, as shown, are often not sufficient in order to Wake up, for example, soundly sleeping man.

SINCE WATERED AUTOMATICALLY

26.05.201813.05.2018Devices helpers

Offer favorite journal I developed a system of automatic watering and spraying plants, well-proven both in the room and in the greenhouse, Conservatory and flower garden. It includes two interrelated processes: “sensor — water” (Fig. 1) and automatic electronic control (Fig. 2). And if the first is easy even going to beginners, the second is better to entrust to those who have sufficient experience and knowledge in the field of electrical and radio engineering.

THE SECOND PROFESSION OF AN ELECTROCARDIOGRAPH

25.05.201813.05.2018Devices helpers

In the process of creating Amateur designs may require tools and equipment that are available it is often difficult. In such cases, comes to the aid of ingenuity, and craftsmen are doing everything they can with their hands. We will talk about how you can make a real recorder-thermoregulator from the old electrocardiograph type ЭК1Т-03M (Fig. 1).

Music game world

25.05.201813.05.2018Devices helpers

Deserved recognition and popularity enjoyed by amateur radio operators is quite simple and reliable circuit includes flip-flop on the two transistors and a pair of thyristors controlled them. It allows you to alternately switch the four incandescent lamps or garlands for the effect of “running lights”.

MULTIMETER MOTORIST

25.05.201813.05.2018Devices helpers

Owners of digital multimeters offer to acquire a homemade console that will allow you to convert the popular M-830 M-832 and their counterparts in the universal devices, capable to become a reliable assistant and service vehicles. In particular, it will be possible (along with the already mastered many of the health check of the relay-regulator, a current measurement battery power and other electrical parameters on-Board network) to quickly estimate the important performance of the ignition system carburetor of the engine, as the crankshaft rotation and angle, open (easily converted into a corner closed) status breaker contacts.

THE TESTER IN YOUR POCKET

25.05.201813.05.2018Devices helpers

By making a mini tester, for several years I use them when repairing household electrical and radio engineering. Assembled by the classical scheme, the device allows with a sufficient accuracy for practice to measure the voltage to 300 V in DC and AC, test resistors, diodes, transistors, and capacitors.

YOUR E-PSYCHOLOGIST

25.05.201813.05.2018Devices helpers

A set of electronic devices that use psychologists is constantly expanding. In addition to the “Polygraph” (the”lie detector”), there are other devices to test the emotional state of the person. The hallmark of the modern psychologists is electronic visual and sound indications, the ability to connect to the computer and transfer data across large distances. A simple device of this type it is not difficult to do with basic skills build the circuits.

ELECTRONICS: FROM DESIGN TO FILLING

25.05.201813.05.2018Devices helpers

It would seem that all good pocket flashlight “Elektronika B6-03”: from design to filling, including a fairly capacious battery of three disk accumulators D-0,26. But… As shown by operating experience, the charger it is truly useless.

ELECTRONIC DISCONNECT SWITCH

24.05.201813.05.2018Devices helpers

In the journal “modelist-Konstruktor” No. 10 for the year 1985 was published a description of the electronic disconnect switch (VMS) for the battery (AB) of the vehicle. The originality and simplicity of the scheme I liked. Of course, I used it on my car. And creatively. The result is a design which, unlike the prototype, allows you to successfully use e-VM even when the on-Board network contingencies of a short circuit. In addition, my design provides for the on indicator. But this added convenience.